/Engine/Source/Editor/CurveEditor/Public/CurveEditorSettings.h
Get custom color for object and property if it exists, if it doesn't the optional won't be set
[TOptional](API\Runtime\Core\IO\TOptional)< [FLinearColor](API\Runtime\Core\Math\FLinearColor) > GetCustomColor ( [UClass](API\Runtime\CoreUObject\UObject\UClass) * InClass, const [FString](API\Runtime\Core\Containers\FString) & InPropertyName ) const